info
The info command retrieves a hardware description from a device. All MCI devices recognize this command.
To send this command, call the mciSendString function with the lpszCommand parameter set as follows.
_stprintf_s(
lpszCommand,
TEXT("info %s %s %s"),
lpszDeviceID,
lpszInfoType,
lpszFlags
);
Parameters
lpszDeviceID
Identifier of an MCI device. This identifier or alias is assigned when the device is opened.
lpszInfoType
Flag that identifies the type of information required. The following table lists device types that recognize the info command and the flags used by each type.
| Value | Meaning | Meaning |
| cdaudio | info identity info upc |
product |
| digitalvideo | audio algorithm audio quality file product still algorithm still quality |
usage version video algorithm video quality window text |
| overlay | file product |
window text |
| sequencer | copyright file |
name product |
| vcr | product | version |
| videodisc | product | |
| waveaudio | file input |
output product |
The following table lists the flags that can be specified in the lpszInfoType parameter and their meanings.
| Value | Meaning |
| audio algorithm | Returns the name of the current audio compression algorithm. |
| audio quality | Returns the name for the current audio quality descriptor. This might return "unknown" if the application has set parameters to specific values that do not correspond to defined qualities. |
| copyright | Retrieves the MIDI file copyright notice from the copyright meta event. |
| file | Retrieves the name of the file used by the compound device. If the device is opened without a file and the load command has not been used, a null string is returned. |
| info identity | Produces a unique identifier for the audio CD currently loaded in the player being queried. |
| info upc | Produces the Universal Product Code (UPC) that is encoded on an audio CD. The UPC is a string of digits. It might not be available for all CDs. |
| input | Retrieves the description of the current input device. Returns "none" if an input device is not set. |
| name | Retrieves the sequence name from the sequence/track name meta event. |
| output | Retrieves the description of the current output device. Returns "none" if an output device is not set. |
| product | Retrieves a description of the device. This information often includes the product name and model. The string length will be 31 characters or fewer. |
| still algorithm | Returns the name of the current still image compression algorithm. |
| still quality | Returns the name for the current still image quality descriptor. This might return "unknown" if the application has set parameters to specific values that do not correspond to defined qualities. |
| usage | Returns a string describing usage restrictions that might be imposed by the owner of the visual or audio data in the workspace. |
| version | Returns the release level of the device driver and hardware. |
| video algorithm | Returns the name of the current video compression algorithm. |
| video quality | Returns the name for the current video quality descriptor. This might return "unknown" if the application has set parameters to specific values that do not correspond to defined qualities. |
| window text | Retrieves the caption of the window used by the device. |
lpszFlags
Can be "wait", "notify", or both. For digital-video and VCR devices, "test" can also be specified. For more information about these flags, see The Wait, Notify, and Test Flags.
Return Values
Returns zero if successful or an error otherwise.
Remarks
The following command retrieves a description of the hardware associated with the "mysound" device:
info mysound product
Requirements
** Windows NT/2000/XP:** Included in Windows NT 3.1 and later.
** Windows 95/98/Me:** Included in Windows 95 and later.
See Also